A current \( i \) ampere flows in a circular arc of wire whose radi...

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A current \( i \) ampere flows in a circular arc of wire whose radius is \( R \), which subtend an angle \( 3 \pi / 2 \) radian at
P its centre. The magnetic induction \( B \) at the centre is

W
(1) \( \frac{\mu_{0} \mathrm{i}}{\mathrm{R}} \)
(2) \( \frac{\mu_{0} \mathrm{i}}{2 \mathrm{R}} \)
(3) \( \frac{2 \mu_{0} i}{R} \)
(4) \( \frac{3 \mu_{0} \mathrm{i}}{8 \mathrm{R}} \)
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